Borgholm - Ismantorpsborg

27km/17mi south of Borgholm is Ismantorpsborg, the most striking of the refuge forts on Öland, probably dating from the period of the great migrations. It has a diameter of some 125m/400ft, and within its well-preserved ramparts are 88 hut bases. Unusually, it has no fewer than nine entrances, suggesting that it was primarily a cult site.